* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
+/* \summary: Internet Control Message Protocol (ICMP) printer */
+
+#include <config.h>
-#include <tcpdump-stdinc.h>
+#include "netdissect-stdinc.h"
#include <stdio.h>
#include <string.h>
-#include "interface.h"
+#include "netdissect.h"
#include "addrtoname.h"
-#include "extract.h" /* must come after interface.h */
+#include "extract.h"
#include "ip.h"
#include "udp.h"
* Structure of an icmp header.
*/
struct icmp {
- uint8_t icmp_type; /* type of message, see below */
- uint8_t icmp_code; /* type sub code */
- uint16_t icmp_cksum; /* ones complement cksum of struct */
+ nd_uint8_t icmp_type; /* type of message, see below */
+ nd_uint8_t icmp_code; /* type sub code */
+ nd_uint16_t icmp_cksum; /* ones complement cksum of struct */
union {
- uint8_t ih_pptr; /* ICMP_PARAMPROB */
- struct in_addr ih_gwaddr; /* ICMP_REDIRECT */
+ nd_uint8_t ih_pptr; /* ICMP_PARAMPROB */
+ nd_ipv4 ih_gwaddr; /* ICMP_REDIRECT */
struct ih_idseq {
- uint16_t icd_id;
- uint16_t icd_seq;
+ nd_uint16_t icd_id;
+ nd_uint16_t icd_seq;
} ih_idseq;
- uint32_t ih_void;
+ nd_uint32_t ih_void;
} icmp_hun;
#define icmp_pptr icmp_hun.ih_pptr
#define icmp_gwaddr icmp_hun.ih_gwaddr
#define icmp_void icmp_hun.ih_void
union {
struct id_ts {
- uint32_t its_otime;
- uint32_t its_rtime;
- uint32_t its_ttime;
+ nd_uint32_t its_otime;
+ nd_uint32_t its_rtime;
+ nd_uint32_t its_ttime;
} id_ts;
struct id_ip {
struct ip idi_ip;
/* options and then 64 bits of data */
} id_ip;
- uint32_t id_mask;
- uint8_t id_data[1];
+ nd_uint32_t id_mask;
+ nd_byte id_data[1];
} icmp_dun;
#define icmp_otime icmp_dun.id_ts.its_otime
#define icmp_rtime icmp_dun.id_ts.its_rtime
#define icmp_data icmp_dun.id_data
};
-#define ICMP_MPLS_EXT_EXTRACT_VERSION(x) (((x)&0xf0)>>4)
-#define ICMP_MPLS_EXT_VERSION 2
-
/*
* Lower bounds on packet lengths for various types.
* For the error advice packets must first insure that the
- * packet is large enought to contain the returned ip header.
+ * packet is large enough to contain the returned ip header.
* Only then can we do the check to see if 64 bits of packet
* data have been returned, since we need to check the returned
* ip header length.
((type) == ICMP_UNREACH || (type) == ICMP_SOURCEQUENCH || \
(type) == ICMP_REDIRECT || (type) == ICMP_TIMXCEED || \
(type) == ICMP_PARAMPROB)
-#define ICMP_MPLS_EXT_TYPE(type) \
+#define ICMP_MULTIPART_EXT_TYPE(type) \
((type) == ICMP_UNREACH || \
(type) == ICMP_TIMXCEED || \
(type) == ICMP_PARAMPROB)
{ 0, NULL }
};
-/* Formats for most of the ICMP_UNREACH codes */
-static const struct tok unreach2str[] = {
- { ICMP_UNREACH_NET, "net %s unreachable" },
- { ICMP_UNREACH_HOST, "host %s unreachable" },
- { ICMP_UNREACH_SRCFAIL,
- "%s unreachable - source route failed" },
- { ICMP_UNREACH_NET_UNKNOWN, "net %s unreachable - unknown" },
- { ICMP_UNREACH_HOST_UNKNOWN, "host %s unreachable - unknown" },
- { ICMP_UNREACH_ISOLATED,
- "%s unreachable - source host isolated" },
- { ICMP_UNREACH_NET_PROHIB,
- "net %s unreachable - admin prohibited" },
- { ICMP_UNREACH_HOST_PROHIB,
- "host %s unreachable - admin prohibited" },
- { ICMP_UNREACH_TOSNET,
- "net %s unreachable - tos prohibited" },
- { ICMP_UNREACH_TOSHOST,
- "host %s unreachable - tos prohibited" },
- { ICMP_UNREACH_FILTER_PROHIB,
- "host %s unreachable - admin prohibited filter" },
- { ICMP_UNREACH_HOST_PRECEDENCE,
- "host %s unreachable - host precedence violation" },
- { ICMP_UNREACH_PRECEDENCE_CUTOFF,
- "host %s unreachable - precedence cutoff" },
- { 0, NULL }
-};
-
-/* Formats for the ICMP_REDIRECT codes */
-static const struct tok type2str[] = {
- { ICMP_REDIRECT_NET, "redirect %s to net %s" },
- { ICMP_REDIRECT_HOST, "redirect %s to host %s" },
- { ICMP_REDIRECT_TOSNET, "redirect-tos %s to net %s" },
- { ICMP_REDIRECT_TOSHOST, "redirect-tos %s to host %s" },
- { 0, NULL }
-};
-
/* rfc1191 */
struct mtu_discovery {
- uint16_t unused;
- uint16_t nexthopmtu;
+ nd_uint16_t unused;
+ nd_uint16_t nexthopmtu;
};
/* rfc1256 */
struct ih_rdiscovery {
- uint8_t ird_addrnum;
- uint8_t ird_addrsiz;
- uint16_t ird_lifetime;
+ nd_uint8_t ird_addrnum;
+ nd_uint8_t ird_addrsiz;
+ nd_uint16_t ird_lifetime;
};
struct id_rdiscovery {
- uint32_t ird_addr;
- uint32_t ird_pref;
+ nd_uint32_t ird_addr;
+ nd_uint32_t ird_pref;
};
/*
- * draft-bonica-internet-icmp-08
+ * RFC 4884 - Extended ICMP to Support Multi-Part Messages
+ *
+ * This is a general extension mechanism, based on the mechanism
+ * in draft-bonica-icmp-mpls-02 ICMP Extensions for MultiProtocol
+ * Label Switching.
*
* The Destination Unreachable, Time Exceeded
- * and Parameter Problem messages are slighly changed as per
- * the above draft. A new Length field gets added to give
- * the caller an idea about the length of the piggypacked
- * IP packet before the MPLS extension header starts.
+ * and Parameter Problem messages are slightly changed as per
+ * the above RFC. A new Length field gets added to give
+ * the caller an idea about the length of the piggybacked
+ * IP packet before the extension header starts.
*
* The Length field represents length of the padded "original datagram"
* field measured in 32-bit words.
*/
struct icmp_ext_t {
- uint8_t icmp_type;
- uint8_t icmp_code;
- uint8_t icmp_checksum[2];
- uint8_t icmp_reserved;
- uint8_t icmp_length;
- uint8_t icmp_reserved2[2];
- uint8_t icmp_ext_legacy_header[128]; /* extension header starts 128 bytes after ICMP header */
- uint8_t icmp_ext_version_res[2];
- uint8_t icmp_ext_checksum[2];
- uint8_t icmp_ext_data[1];
+ nd_uint8_t icmp_type;
+ nd_uint8_t icmp_code;
+ nd_uint16_t icmp_checksum;
+ nd_byte icmp_reserved;
+ nd_uint8_t icmp_length;
+ nd_byte icmp_reserved2[2];
+ nd_byte icmp_ext_legacy_header[128]; /* extension header starts 128 bytes after ICMP header */
+ nd_byte icmp_ext_version_res[2];
+ nd_uint16_t icmp_ext_checksum;
+ nd_byte icmp_ext_data[1];
};
-struct icmp_mpls_ext_object_header_t {
- uint8_t length[2];
- uint8_t class_num;
- uint8_t ctype;
+/*
+ * Extract version from the first octet of icmp_ext_version_res.
+ */
+#define ICMP_EXT_EXTRACT_VERSION(x) (((x)&0xf0)>>4)
+
+/*
+ * Current version.
+ */
+#define ICMP_EXT_VERSION 2
+
+/*
+ * Extension object class numbers.
+ *
+ * Class 1 dates back to draft-bonica-icmp-mpls-02.
+ */
+
+/* rfc4950 */
+#define MPLS_STACK_ENTRY_OBJECT_CLASS 1
+
+struct icmp_multipart_ext_object_header_t {
+ nd_uint16_t length;
+ nd_uint8_t class_num;
+ nd_uint8_t ctype;
};
-static const struct tok icmp_mpls_ext_obj_values[] = {
+static const struct tok icmp_multipart_ext_obj_values[] = {
{ 1, "MPLS Stack Entry" },
- { 2, "Extended Payload" },
+ { 2, "Interface Identification" },
{ 0, NULL}
};
{
char *cp;
const struct icmp *dp;
+ uint8_t icmp_type, icmp_code;
const struct icmp_ext_t *ext_dp;
const struct ip *ip;
- const char *str, *fmt;
+ const char *str;
const struct ip *oip;
+ uint8_t ip_proto;
const struct udphdr *ouh;
const uint8_t *obj_tptr;
uint32_t raw_label;
- const u_char *snapend_save;
- const struct icmp_mpls_ext_object_header_t *icmp_mpls_ext_object_header;
- u_int hlen, dport, mtu, obj_tlen, obj_class_num, obj_ctype;
+ const struct icmp_multipart_ext_object_header_t *icmp_multipart_ext_object_header;
+ u_int hlen, mtu, obj_tlen, obj_class_num, obj_ctype;
+ uint16_t dport;
char buf[MAXHOSTNAMELEN + 100];
struct cksum_vec vec[1];
- dp = (struct icmp *)bp;
- ext_dp = (struct icmp_ext_t *)bp;
- ip = (struct ip *)bp2;
+ ndo->ndo_protocol = "icmp";
+ dp = (const struct icmp *)bp;
+ ext_dp = (const struct icmp_ext_t *)bp;
+ ip = (const struct ip *)bp2;
str = buf;
- ND_TCHECK(dp->icmp_code);
- switch (dp->icmp_type) {
+ icmp_type = GET_U_1(dp->icmp_type);
+ icmp_code = GET_U_1(dp->icmp_code);
+ switch (icmp_type) {
case ICMP_ECHO:
case ICMP_ECHOREPLY:
- ND_TCHECK(dp->icmp_seq);
(void)snprintf(buf, sizeof(buf), "echo %s, id %u, seq %u",
- dp->icmp_type == ICMP_ECHO ?
+ icmp_type == ICMP_ECHO ?
"request" : "reply",
- EXTRACT_16BITS(&dp->icmp_id),
- EXTRACT_16BITS(&dp->icmp_seq));
+ GET_BE_U_2(dp->icmp_id),
+ GET_BE_U_2(dp->icmp_seq));
break;
case ICMP_UNREACH:
- ND_TCHECK(dp->icmp_ip.ip_dst);
- switch (dp->icmp_code) {
+ switch (icmp_code) {
+
+ case ICMP_UNREACH_NET:
+ (void)snprintf(buf, sizeof(buf),
+ "net %s unreachable",
+ GET_IPADDR_STRING(dp->icmp_ip.ip_dst));
+ break;
+
+ case ICMP_UNREACH_HOST:
+ (void)snprintf(buf, sizeof(buf),
+ "host %s unreachable",
+ GET_IPADDR_STRING(dp->icmp_ip.ip_dst));
+ break;
case ICMP_UNREACH_PROTOCOL:
- ND_TCHECK(dp->icmp_ip.ip_p);
(void)snprintf(buf, sizeof(buf),
- "%s protocol %d unreachable",
- ipaddr_string(ndo, &dp->icmp_ip.ip_dst),
- dp->icmp_ip.ip_p);
+ "%s protocol %u unreachable",
+ GET_IPADDR_STRING(dp->icmp_ip.ip_dst),
+ GET_U_1(dp->icmp_ip.ip_p));
break;
case ICMP_UNREACH_PORT:
- ND_TCHECK(dp->icmp_ip.ip_p);
+ ND_TCHECK_1(dp->icmp_ip.ip_p);
oip = &dp->icmp_ip;
hlen = IP_HL(oip) * 4;
- ouh = (struct udphdr *)(((u_char *)oip) + hlen);
- ND_TCHECK(ouh->uh_dport);
- dport = EXTRACT_16BITS(&ouh->uh_dport);
- switch (oip->ip_p) {
+ ouh = (const struct udphdr *)(((const u_char *)oip) + hlen);
+ dport = GET_BE_U_2(ouh->uh_dport);
+ ip_proto = GET_U_1(oip->ip_p);
+ switch (ip_proto) {
case IPPROTO_TCP:
(void)snprintf(buf, sizeof(buf),
"%s tcp port %s unreachable",
- ipaddr_string(ndo, &oip->ip_dst),
- tcpport_string(dport));
+ GET_IPADDR_STRING(oip->ip_dst),
+ tcpport_string(ndo, dport));
break;
case IPPROTO_UDP:
(void)snprintf(buf, sizeof(buf),
"%s udp port %s unreachable",
- ipaddr_string(ndo, &oip->ip_dst),
- udpport_string(dport));
+ GET_IPADDR_STRING(oip->ip_dst),
+ udpport_string(ndo, dport));
break;
default:
(void)snprintf(buf, sizeof(buf),
- "%s protocol %d port %d unreachable",
- ipaddr_string(ndo, &oip->ip_dst),
- oip->ip_p, dport);
+ "%s protocol %u port %u unreachable",
+ GET_IPADDR_STRING(oip->ip_dst),
+ ip_proto, dport);
break;
}
break;
case ICMP_UNREACH_NEEDFRAG:
{
- register const struct mtu_discovery *mp;
- mp = (struct mtu_discovery *)(u_char *)&dp->icmp_void;
- mtu = EXTRACT_16BITS(&mp->nexthopmtu);
+ const struct mtu_discovery *mp;
+ mp = (const struct mtu_discovery *)(const u_char *)&dp->icmp_void;
+ mtu = GET_BE_U_2(mp->nexthopmtu);
if (mtu) {
(void)snprintf(buf, sizeof(buf),
- "%s unreachable - need to frag (mtu %d)",
- ipaddr_string(ndo, &dp->icmp_ip.ip_dst), mtu);
+ "%s unreachable - need to frag (mtu %u)",
+ GET_IPADDR_STRING(dp->icmp_ip.ip_dst), mtu);
} else {
(void)snprintf(buf, sizeof(buf),
"%s unreachable - need to frag",
- ipaddr_string(ndo, &dp->icmp_ip.ip_dst));
+ GET_IPADDR_STRING(dp->icmp_ip.ip_dst));
}
}
break;
+ case ICMP_UNREACH_SRCFAIL:
+ (void)snprintf(buf, sizeof(buf),
+ "%s unreachable - source route failed",
+ GET_IPADDR_STRING(dp->icmp_ip.ip_dst));
+ break;
+
+ case ICMP_UNREACH_NET_UNKNOWN:
+ (void)snprintf(buf, sizeof(buf),
+ "net %s unreachable - unknown",
+ GET_IPADDR_STRING(dp->icmp_ip.ip_dst));
+ break;
+
+ case ICMP_UNREACH_HOST_UNKNOWN:
+ (void)snprintf(buf, sizeof(buf),
+ "host %s unreachable - unknown",
+ GET_IPADDR_STRING(dp->icmp_ip.ip_dst));
+ break;
+
+ case ICMP_UNREACH_ISOLATED:
+ (void)snprintf(buf, sizeof(buf),
+ "%s unreachable - source host isolated",
+ GET_IPADDR_STRING(dp->icmp_ip.ip_dst));
+ break;
+
+ case ICMP_UNREACH_NET_PROHIB:
+ (void)snprintf(buf, sizeof(buf),
+ "net %s unreachable - admin prohibited",
+ GET_IPADDR_STRING(dp->icmp_ip.ip_dst));
+ break;
+
+ case ICMP_UNREACH_HOST_PROHIB:
+ (void)snprintf(buf, sizeof(buf),
+ "host %s unreachable - admin prohibited",
+ GET_IPADDR_STRING(dp->icmp_ip.ip_dst));
+ break;
+
+ case ICMP_UNREACH_TOSNET:
+ (void)snprintf(buf, sizeof(buf),
+ "net %s unreachable - tos prohibited",
+ GET_IPADDR_STRING(dp->icmp_ip.ip_dst));
+ break;
+
+ case ICMP_UNREACH_TOSHOST:
+ (void)snprintf(buf, sizeof(buf),
+ "host %s unreachable - tos prohibited",
+ GET_IPADDR_STRING(dp->icmp_ip.ip_dst));
+ break;
+
+ case ICMP_UNREACH_FILTER_PROHIB:
+ (void)snprintf(buf, sizeof(buf),
+ "host %s unreachable - admin prohibited filter",
+ GET_IPADDR_STRING(dp->icmp_ip.ip_dst));
+ break;
+
+ case ICMP_UNREACH_HOST_PRECEDENCE:
+ (void)snprintf(buf, sizeof(buf),
+ "host %s unreachable - host precedence violation",
+ GET_IPADDR_STRING(dp->icmp_ip.ip_dst));
+ break;
+
+ case ICMP_UNREACH_PRECEDENCE_CUTOFF:
+ (void)snprintf(buf, sizeof(buf),
+ "host %s unreachable - precedence cutoff",
+ GET_IPADDR_STRING(dp->icmp_ip.ip_dst));
+ break;
+
default:
- fmt = tok2str(unreach2str, "#%d %%s unreachable",
- dp->icmp_code);
- (void)snprintf(buf, sizeof(buf), fmt,
- ipaddr_string(ndo, &dp->icmp_ip.ip_dst));
+ (void)snprintf(buf, sizeof(buf),
+ "%s unreachable - #%u",
+ GET_IPADDR_STRING(dp->icmp_ip.ip_dst),
+ icmp_code);
break;
}
break;
case ICMP_REDIRECT:
- ND_TCHECK(dp->icmp_ip.ip_dst);
- fmt = tok2str(type2str, "redirect-#%d %%s to net %%s",
- dp->icmp_code);
- (void)snprintf(buf, sizeof(buf), fmt,
- ipaddr_string(ndo, &dp->icmp_ip.ip_dst),
- ipaddr_string(ndo, &dp->icmp_gwaddr));
+ switch (icmp_code) {
+
+ case ICMP_REDIRECT_NET:
+ (void)snprintf(buf, sizeof(buf),
+ "redirect %s to net %s",
+ GET_IPADDR_STRING(dp->icmp_ip.ip_dst),
+ GET_IPADDR_STRING(dp->icmp_gwaddr));
+ break;
+
+ case ICMP_REDIRECT_HOST:
+ (void)snprintf(buf, sizeof(buf),
+ "redirect %s to host %s",
+ GET_IPADDR_STRING(dp->icmp_ip.ip_dst),
+ GET_IPADDR_STRING(dp->icmp_gwaddr));
+ break;
+
+ case ICMP_REDIRECT_TOSNET:
+ (void)snprintf(buf, sizeof(buf),
+ "redirect-tos %s to net %s",
+ GET_IPADDR_STRING(dp->icmp_ip.ip_dst),
+ GET_IPADDR_STRING(dp->icmp_gwaddr));
+ break;
+
+ case ICMP_REDIRECT_TOSHOST:
+ (void)snprintf(buf, sizeof(buf),
+ "redirect-tos %s to host %s",
+ GET_IPADDR_STRING(dp->icmp_ip.ip_dst),
+ GET_IPADDR_STRING(dp->icmp_gwaddr));
+ break;
+
+ default:
+ (void)snprintf(buf, sizeof(buf),
+ "redirect-#%u %s to %s", icmp_code,
+ GET_IPADDR_STRING(dp->icmp_ip.ip_dst),
+ GET_IPADDR_STRING(dp->icmp_gwaddr));
+ break;
+ }
break;
case ICMP_ROUTERADVERT:
{
- register const struct ih_rdiscovery *ihp;
- register const struct id_rdiscovery *idp;
+ const struct ih_rdiscovery *ihp;
+ const struct id_rdiscovery *idp;
u_int lifetime, num, size;
(void)snprintf(buf, sizeof(buf), "router advertisement");
cp = buf + strlen(buf);
- ihp = (struct ih_rdiscovery *)&dp->icmp_void;
- ND_TCHECK(*ihp);
+ ihp = (const struct ih_rdiscovery *)&dp->icmp_void;
+ ND_TCHECK_SIZE(ihp);
(void)strncpy(cp, " lifetime ", sizeof(buf) - (cp - buf));
cp = buf + strlen(buf);
- lifetime = EXTRACT_16BITS(&ihp->ird_lifetime);
+ lifetime = GET_BE_U_2(ihp->ird_lifetime);
if (lifetime < 60) {
(void)snprintf(cp, sizeof(buf) - (cp - buf), "%u",
lifetime);
}
cp = buf + strlen(buf);
- num = ihp->ird_addrnum;
- (void)snprintf(cp, sizeof(buf) - (cp - buf), " %d:", num);
+ num = GET_U_1(ihp->ird_addrnum);
+ (void)snprintf(cp, sizeof(buf) - (cp - buf), " %u:", num);
cp = buf + strlen(buf);
- size = ihp->ird_addrsiz;
+ size = GET_U_1(ihp->ird_addrsiz);
if (size != 2) {
(void)snprintf(cp, sizeof(buf) - (cp - buf),
- " [size %d]", size);
+ " [size %u]", size);
break;
}
- idp = (struct id_rdiscovery *)&dp->icmp_data;
- while (num-- > 0) {
- ND_TCHECK(*idp);
+ idp = (const struct id_rdiscovery *)&dp->icmp_data;
+ while (num > 0) {
+ ND_TCHECK_SIZE(idp);
(void)snprintf(cp, sizeof(buf) - (cp - buf), " {%s %u}",
- ipaddr_string(ndo, &idp->ird_addr),
- EXTRACT_32BITS(&idp->ird_pref));
+ GET_IPADDR_STRING(idp->ird_addr),
+ GET_BE_U_4(idp->ird_pref));
cp = buf + strlen(buf);
++idp;
+ num--;
}
}
break;
case ICMP_TIMXCEED:
- ND_TCHECK(dp->icmp_ip.ip_dst);
- switch (dp->icmp_code) {
+ ND_TCHECK_4(dp->icmp_ip.ip_dst);
+ switch (icmp_code) {
case ICMP_TIMXCEED_INTRANS:
str = "time exceeded in-transit";
break;
default:
- (void)snprintf(buf, sizeof(buf), "time exceeded-#%d",
- dp->icmp_code);
+ (void)snprintf(buf, sizeof(buf), "time exceeded-#%u",
+ icmp_code);
break;
}
break;
case ICMP_PARAMPROB:
- if (dp->icmp_code)
+ if (icmp_code)
(void)snprintf(buf, sizeof(buf),
- "parameter problem - code %d", dp->icmp_code);
+ "parameter problem - code %u", icmp_code);
else {
- ND_TCHECK(dp->icmp_pptr);
(void)snprintf(buf, sizeof(buf),
- "parameter problem - octet %d", dp->icmp_pptr);
+ "parameter problem - octet %u",
+ GET_U_1(dp->icmp_pptr));
}
break;
case ICMP_MASKREPLY:
- ND_TCHECK(dp->icmp_mask);
(void)snprintf(buf, sizeof(buf), "address mask is 0x%08x",
- EXTRACT_32BITS(&dp->icmp_mask));
+ GET_BE_U_4(dp->icmp_mask));
break;
case ICMP_TSTAMP:
- ND_TCHECK(dp->icmp_seq);
(void)snprintf(buf, sizeof(buf),
"time stamp query id %u seq %u",
- EXTRACT_16BITS(&dp->icmp_id),
- EXTRACT_16BITS(&dp->icmp_seq));
+ GET_BE_U_2(dp->icmp_id),
+ GET_BE_U_2(dp->icmp_seq));
break;
case ICMP_TSTAMPREPLY:
- ND_TCHECK(dp->icmp_ttime);
+ ND_TCHECK_4(dp->icmp_ttime);
(void)snprintf(buf, sizeof(buf),
"time stamp reply id %u seq %u: org %s",
- EXTRACT_16BITS(&dp->icmp_id),
- EXTRACT_16BITS(&dp->icmp_seq),
- icmp_tstamp_print(EXTRACT_32BITS(&dp->icmp_otime)));
+ GET_BE_U_2(dp->icmp_id),
+ GET_BE_U_2(dp->icmp_seq),
+ icmp_tstamp_print(GET_BE_U_4(dp->icmp_otime)));
(void)snprintf(buf+strlen(buf),sizeof(buf)-strlen(buf),", recv %s",
- icmp_tstamp_print(EXTRACT_32BITS(&dp->icmp_rtime)));
+ icmp_tstamp_print(GET_BE_U_4(dp->icmp_rtime)));
(void)snprintf(buf+strlen(buf),sizeof(buf)-strlen(buf),", xmit %s",
- icmp_tstamp_print(EXTRACT_32BITS(&dp->icmp_ttime)));
+ icmp_tstamp_print(GET_BE_U_4(dp->icmp_ttime)));
break;
default:
- str = tok2str(icmp2str, "type-#%d", dp->icmp_type);
+ str = tok2str(icmp2str, "type-#%u", icmp_type);
break;
}
- ND_PRINT((ndo, "ICMP %s, length %u", str, plen));
+ ND_PRINT("ICMP %s, length %u", str, plen);
if (ndo->ndo_vflag && !fragmented) { /* don't attempt checksumming if this is a frag */
- uint16_t sum, icmp_sum;
- struct cksum_vec vec[1];
- if (ND_TTEST2(*bp, plen)) {
- vec[0].ptr = (const uint8_t *)(void *)dp;
+ if (ND_TTEST_LEN(bp, plen)) {
+ uint16_t sum;
+
+ vec[0].ptr = (const uint8_t *)(const void *)dp;
vec[0].len = plen;
sum = in_cksum(vec, 1);
if (sum != 0) {
- icmp_sum = EXTRACT_16BITS(&dp->icmp_cksum);
- ND_PRINT((ndo, " (wrong icmp cksum %x (->%x)!)",
+ uint16_t icmp_sum = GET_BE_U_2(dp->icmp_cksum);
+ ND_PRINT(" (wrong icmp cksum %x (->%x)!)",
icmp_sum,
- in_cksum_shouldbe(icmp_sum, sum)));
+ in_cksum_shouldbe(icmp_sum, sum));
}
}
}
/*
* print the remnants of the IP packet.
- * save the snaplength as this may get overidden in the IP printer.
+ * save the snaplength as this may get overridden in the IP printer.
*/
- if (ndo->ndo_vflag >= 1 && ICMP_ERRTYPE(dp->icmp_type)) {
+ if (ndo->ndo_vflag >= 1 && ICMP_ERRTYPE(icmp_type)) {
+ const u_char *snapend_save;
+
bp += 8;
- ND_PRINT((ndo, "\n\t"));
- ip = (struct ip *)bp;
- ndo->ndo_snaplen = ndo->ndo_snapend - bp;
- snapend_save = ndo->ndo_snapend;
- ip_print(ndo, bp, EXTRACT_16BITS(&ip->ip_len));
- ndo->ndo_snapend = snapend_save;
+ ND_PRINT("\n\t");
+ ip = (const struct ip *)bp;
+ snapend_save = ndo->ndo_snapend;
+ /*
+ * Update the snapend because extensions (MPLS, ...) may be
+ * present after the IP packet. In this case the current
+ * (outer) packet's snapend is not what ip_print() needs to
+ * decode an IP packet nested in the middle of an ICMP payload.
+ *
+ * This prevents that, in ip_print(), for the nested IP packet,
+ * the remaining length < remaining caplen.
+ */
+ ndo->ndo_snapend = ND_MIN(bp + GET_BE_U_2(ip->ip_len),
+ ndo->ndo_snapend);
+ ip_print(ndo, bp, GET_BE_U_2(ip->ip_len));
+ ndo->ndo_snapend = snapend_save;
}
+ /* ndo_protocol reassignment after ip_print() call */
+ ndo->ndo_protocol = "icmp";
+
/*
- * Attempt to decode the MPLS extensions only for some ICMP types.
+ * Attempt to decode multi-part message extensions (rfc4884) only for some ICMP types.
*/
- if (ndo->ndo_vflag >= 1 && plen > ICMP_EXTD_MINLEN && ICMP_MPLS_EXT_TYPE(dp->icmp_type)) {
+ if (ndo->ndo_vflag >= 1 && plen > ICMP_EXTD_MINLEN && ICMP_MULTIPART_EXT_TYPE(icmp_type)) {
- ND_TCHECK(*ext_dp);
+ ND_TCHECK_SIZE(ext_dp);
/*
- * Check first if the mpls extension header shows a non-zero length.
+ * Check first if the multi-part extension header shows a non-zero length.
* If the length field is not set then silently verify the checksum
* to check if an extension header is present. This is expedient,
* however not all implementations set the length field proper.
*/
- if (!ext_dp->icmp_length) {
- vec[0].ptr = (const uint8_t *)(void *)&ext_dp->icmp_ext_version_res;
+ if (GET_U_1(ext_dp->icmp_length) == 0 &&
+ ND_TTEST_LEN(ext_dp->icmp_ext_version_res, plen - ICMP_EXTD_MINLEN)) {
+ vec[0].ptr = (const uint8_t *)(const void *)&ext_dp->icmp_ext_version_res;
vec[0].len = plen - ICMP_EXTD_MINLEN;
if (in_cksum(vec, 1)) {
return;
}
}
- ND_PRINT((ndo, "\n\tMPLS extension v%u",
- ICMP_MPLS_EXT_EXTRACT_VERSION(*(ext_dp->icmp_ext_version_res))));
+ ND_PRINT("\n\tICMP Multi-Part extension v%u",
+ ICMP_EXT_EXTRACT_VERSION(*(ext_dp->icmp_ext_version_res)));
/*
* Sanity checking of the header.
*/
- if (ICMP_MPLS_EXT_EXTRACT_VERSION(*(ext_dp->icmp_ext_version_res)) !=
- ICMP_MPLS_EXT_VERSION) {
- ND_PRINT((ndo, " packet not supported"));
+ if (ICMP_EXT_EXTRACT_VERSION(*(ext_dp->icmp_ext_version_res)) !=
+ ICMP_EXT_VERSION) {
+ ND_PRINT(" packet not supported");
return;
}
hlen = plen - ICMP_EXTD_MINLEN;
- vec[0].ptr = (const uint8_t *)(void *)&ext_dp->icmp_ext_version_res;
- vec[0].len = hlen;
- ND_PRINT((ndo, ", checksum 0x%04x (%scorrect), length %u",
- EXTRACT_16BITS(ext_dp->icmp_ext_checksum),
- in_cksum(vec, 1) ? "in" : "",
- hlen));
+ if (ND_TTEST_LEN(ext_dp->icmp_ext_version_res, hlen)) {
+ vec[0].ptr = (const uint8_t *)(const void *)&ext_dp->icmp_ext_version_res;
+ vec[0].len = hlen;
+ ND_PRINT(", checksum 0x%04x (%scorrect), length %u",
+ GET_BE_U_2(ext_dp->icmp_ext_checksum),
+ in_cksum(vec, 1) ? "in" : "",
+ hlen);
+ }
hlen -= 4; /* subtract common header size */
- obj_tptr = (uint8_t *)ext_dp->icmp_ext_data;
+ obj_tptr = (const uint8_t *)ext_dp->icmp_ext_data;
- while (hlen > sizeof(struct icmp_mpls_ext_object_header_t)) {
+ while (hlen > sizeof(struct icmp_multipart_ext_object_header_t)) {
- icmp_mpls_ext_object_header = (struct icmp_mpls_ext_object_header_t *)obj_tptr;
- ND_TCHECK(*icmp_mpls_ext_object_header);
- obj_tlen = EXTRACT_16BITS(icmp_mpls_ext_object_header->length);
- obj_class_num = icmp_mpls_ext_object_header->class_num;
- obj_ctype = icmp_mpls_ext_object_header->ctype;
- obj_tptr += sizeof(struct icmp_mpls_ext_object_header_t);
+ icmp_multipart_ext_object_header = (const struct icmp_multipart_ext_object_header_t *)obj_tptr;
+ ND_TCHECK_SIZE(icmp_multipart_ext_object_header);
+ obj_tlen = GET_BE_U_2(icmp_multipart_ext_object_header->length);
+ obj_class_num = GET_U_1(icmp_multipart_ext_object_header->class_num);
+ obj_ctype = GET_U_1(icmp_multipart_ext_object_header->ctype);
+ obj_tptr += sizeof(struct icmp_multipart_ext_object_header_t);
- ND_PRINT((ndo, "\n\t %s Object (%u), Class-Type: %u, length %u",
- tok2str(icmp_mpls_ext_obj_values,"unknown",obj_class_num),
+ ND_PRINT("\n\t %s Object (%u), Class-Type: %u, length %u",
+ tok2str(icmp_multipart_ext_obj_values,"unknown",obj_class_num),
obj_class_num,
obj_ctype,
- obj_tlen));
+ obj_tlen);
- hlen-=sizeof(struct icmp_mpls_ext_object_header_t); /* length field includes tlv header */
+ hlen-=sizeof(struct icmp_multipart_ext_object_header_t); /* length field includes tlv header */
/* infinite loop protection */
if ((obj_class_num == 0) ||
- (obj_tlen < sizeof(struct icmp_mpls_ext_object_header_t))) {
+ (obj_tlen < sizeof(struct icmp_multipart_ext_object_header_t))) {
return;
}
- obj_tlen-=sizeof(struct icmp_mpls_ext_object_header_t);
+ obj_tlen-=sizeof(struct icmp_multipart_ext_object_header_t);
switch (obj_class_num) {
- case 1:
+ case MPLS_STACK_ENTRY_OBJECT_CLASS:
switch(obj_ctype) {
case 1:
- ND_TCHECK2(*obj_tptr, 4);
- raw_label = EXTRACT_32BITS(obj_tptr);
- ND_PRINT((ndo, "\n\t label %u, exp %u", MPLS_LABEL(raw_label), MPLS_EXP(raw_label)));
+ raw_label = GET_BE_U_4(obj_tptr);
+ ND_PRINT("\n\t label %u, tc %u", MPLS_LABEL(raw_label), MPLS_TC(raw_label));
if (MPLS_STACK(raw_label))
- ND_PRINT((ndo, ", [S]"));
- ND_PRINT((ndo, ", ttl %u", MPLS_TTL(raw_label)));
+ ND_PRINT(", [S]");
+ ND_PRINT(", ttl %u", MPLS_TTL(raw_label));
break;
default:
print_unknown_data(ndo, obj_tptr, "\n\t ", obj_tlen);
}
break;
- /*
- * FIXME those are the defined objects that lack a decoder
- * you are welcome to contribute code ;-)
- */
- case 2:
default:
print_unknown_data(ndo, obj_tptr, "\n\t ", obj_tlen);
break;
return;
trunc:
- ND_PRINT((ndo, "[|icmp]"));
+ nd_print_trunc(ndo);
}
-/*
- * Local Variables:
- * c-style: whitesmith
- * c-basic-offset: 8
- * End:
- */
projects / tcpdump / blobdiff